/* Tema claro por padrão com alternância para escuro; tipografia Inter */
:root{
  --bg:#f8fafc; --panel:#ffffff; --text:#0f172a; --muted:#475569;
  --brand:#2563eb; --accent:#10b981; --warn:#f59e0b;
  --border:#e2e8f0; --shadow:0 10px 25px rgba(2,6,23,.08);
  --radius:14px; --gap:18px; --pad:18px;
}
[data-theme="dark"]{
  --bg:#0f1220; --panel:#171a2a; --text:#e7e8ee; --muted:#a4a8c0;
  --brand:#6ea8fe; --accent:#5eead4; --warn:#fbbf24;
  --border:#23263a; --shadow:0 10px 25px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:16px/1.7 Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial}
img{max-width:100%;height:auto}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
header{position:sticky;top:0;background:rgba(255,255,255,.8);backdrop-filter:saturate(150%) blur(8px);border-bottom:1px solid var(--border);z-index:10}
[data-theme="dark"] header{background:rgba(15,18,32,.9)}
.nav{max-width:1100px;margin:0 auto;display:flex;gap:24px;align-items:center;justify-content:space-between;padding:14px 20px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.2px}
.brand img{width:32px;height:32px;border-radius:8px}
.menu{display:flex;gap:14px;flex-wrap:wrap}
.menu a{padding:8px 10px;border-radius:10px;color:var(--text)}
.menu a.active,.menu a:hover{background:var(--panel);box-shadow:var(--shadow)}
.menu a.active{outline:1px solid var(--border)}
.theme-toggle{background:var(--panel);border:1px solid var(--border);padding:8px 10px;border-radius:10px;cursor:pointer}
main{max-width:1100px;margin:0 auto;padding:32px 20px}
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center}
.hero h1{font-size:2.25rem;margin:.2rem 0}
.hero p{color:var(--muted);margin:0 0 12px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:12px}
.btn{display:inline-block;padding:12px 16px;border-radius:12px;background:var(--brand);color:#fff;font-weight:700;letter-spacing:.2px;box-shadow:var(--shadow)}
.btn.alt{background:var(--accent);color:#052e2b}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.card{background:var(--panel);border:1px solid var(--border);padding:var(--pad);border-radius:var(--radius);box-shadow:var(--shadow)}
.card.gradient-emerald{background:linear-gradient(180deg,#ecfdf5,#ffffff)}
.card.gradient-blue{background:linear-gradient(180deg,#eff6ff,#ffffff)}
.card.gradient-purple{background:linear-gradient(180deg,#f5f3ff,#ffffff)}
.card-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.card-head h1{margin:0}
.icon{font-size:1.4rem;line-height:1}
.card h3{margin:.2rem 0 .4rem}
.muted{color:var(--muted)}
code,pre{font-family:ui-monospace,Consolas,Menlo,monospace}
pre{background:#0b0e19;border:1px solid var(--border);padding:14px;border-radius:12px;overflow:auto}
[data-theme="light"] pre{background:#0f172a0d}
.section{margin:32px 0}
.list{display:grid;gap:10px}
.note{border-left:3px solid var(--accent);background:rgba(16,185,129,.08);padding:10px 12px;border-radius:8px}
footer{max-width:1100px;margin:30px auto 60px;color:var(--muted);padding:0 20px}
/* Tables */
table{width:100%;border-collapse:collapse}
th,td{padding:10px 8px;border-bottom:1px solid var(--border)}
thead th{border-bottom:1px solid #cbd5e1}
tbody tr:nth-child(even){background:#f1f5f9}
[data-theme="dark"] tbody tr:nth-child(even){background:#111528}

@media (max-width:900px){
  .hero{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  .card{padding:18px}
  .btn{padding:12px 16px}
  .hero h1{font-size:1.9rem}
}

@media (max-width:600px){
  main{padding:24px 16px}
  .nav{padding:12px 16px}
  .grid{gap:14px}
}

/* Acessibilidade e microinterações */
.menu a:focus-visible,.btn:focus-visible,.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.card:hover{border-color:#cbd5e1;transform:translateY(-1px);transition:transform .12s ease,border-color .12s ease}
[data-theme="dark"] .card:hover{border-color:#2f3350}
.btn:hover{filter:brightness(1.03)}

/* Oculto para a11y */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}